Magnetic alignment of electrochemically exfoliated graphite in epoxy as a thermal interface material with high through-plane thermal conductivity

Jeong Heon Ryu, Seo Mi Yang, Jea Uk Lee, Jae Ho Kim, Seung Jae Yang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Thermal management is significant to maintain the reliability and durability of electronic devices. Heat can be dissipated using thermal interface materials (TIMs) comprised of thermally conductive polymers and fillers. Furthermore, it is important to enhance the thermal conductivity of TIMs through the formation of a heat transfer pathway. This paper reports a polymer composite containing vertically aligned electrochemically exfoliated graphite (EEG). We modify the EEG via edge selective oxidation to decorate the surface with iron oxides and enhance the dispersibility of EEG in polymer resin. During the heat treatment and curing process, a magnetic field is applied to the polymer composites to align the iron oxide decorated EEG. The resulting polymer composite containing 25 wt% of filler has a remarkable thermal conductivity of 1.10 W m−1 K−1 after magnetic orientation. These results demonstrate that TIM can be designed with a small amount of filler by magnetic alignment to form an efficient heat transfer pathway.

Original languageEnglish
Pages (from-to)1433-1439
Number of pages7
JournalCarbon Letters
Volume32
Issue number6
DOIs
StatePublished - Oct 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Korean Carbon Society.

Keywords

  • Edge selective oxidation
  • Electrochemically exfoliated graphite
  • Iron oxide coating
  • Magnetic alignment
  • Thermal interface material

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